Not necessarily. A sorcerer with scribe scroll could make a scroll just the same. As a default for random treasure, your statement is likely true, but there is nothing stopping a person from purchasing a sorcerer made scroll or a DM from ruling that any given scroll was actually made by a sorcerer.

Not necessarily. A sorcerer with scribe scroll could make a scroll just the same. As a default for random treasure, your statement is likely true, but there is nothing stopping a person from purchasing a sorcerer made scroll or a DM from ruling that any given scroll was actually made by a sorcerer.

or as a more universal ruling, that Arcane scrolls can be used by any Arcane-able character, and Divine scrolls can be used by any Divine-able character. Shared spells can be used by either

What? No! That converts into a Wizard real easily! Are you willing to re-flavor? All those spells are Wizard spells. See: Ray of Frost: level 1 at-will. Detect Magic and Knowledge: Arcana are both the Arcana skill. Color Spray is a level 3 Wizard encounter power. Dancing Lights is the Prestidigitation cantrip. There's a feat that lets you summon a familiar and spells to summon other creatures, but it's in a book I don't have. There's a feat that gives you more damage with your cold-based spells. Just have him refer to himself as a Sorcerer all the time. Doesn't matter, the flavor can be whatever you want it to be.
The biggest change you'll find is that Wizards don't have to carry around crossbows in 4e. He can cast Ray of Frost as many times as he wants.